The Negroes in Negroland, the Negroes in America, and Negroes Generally; Also, the Several Races of White Men, Considered as the Involuntary and Predestined Supplanters of the Black Races (New York: G. W. Carleton; London: S. Low, Son, and Co., 1868), by Hinton Rowan Helper

The "Historia Brittonum," Commonly Attributed to Nennius, From a Manuscript Lately Discovered in the Library of the Vatican Palace at Rome, Edited in the Tenth Century by Mark the Hermit; With an English Version, Fac Simile of the Original, Notes and Illustrations (London: Printed for J. and A. Arch, 1819), by Nennius, ed. by Mark the Anchorite and William Gunn